Measuring YIG Magnonic Crystals at Millikelvin Temperatures

ORAL

Abstract

Hybrid systems combining magnons and superconducting quantum circuits have attracted increasing interest in recent years [1-3]. Magnonic crystals (MCs) are one of the building blocks of room-temperature magnonics and are used to create devices with an engineered band structure. These devices, exhibiting tunable frequency selectivity and the ability to store travelling excitations in the microwave regime, may form the basis of new tools to be used in the context of quantum information processing. If this potential is to be realised, MCs must be demonstrated to work at the low temperatures required for microwave-frequency quantum experiments. We report the first measurements of the transmission of microwave signals through an MC at 20 mK and observe a magnonic bandgap in both continuous-wave and pulsed excitation experiments. The spin-wave damping at low temperatures in our yttrium iron garnet MC is higher than expected, indicating that further work is necessary before the full potential of quantum experiments using magnonic crystals can be realised.

[1] Tabuchi, Y., et al. Science, 349(6246), (2015)
[2] Lachance-Quirion, D., et al. Science Advances, 3, (2017)
[3] Morris, R. G. E., et al. Scientific Reports, 7, (2017)

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Presenters

  • Sandoko Kosen

    Physics, University of Oxford

Authors

  • Sandoko Kosen

    Physics, University of Oxford

  • Richard Morris

    Department of Physics, University of Oxford, Physics, University of Oxford

  • Arjan Van Loo

    Department of Physics, University of Oxford, Physics, University of Oxford

  • Alexy Karenowska

    Department of Physics, University of Oxford, Physics, University of Oxford